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A Garda spokesperson said: "The three men (two aged in their 30s and one 40s) arrested by Gardaí as part of the investigation have been released without charge, a file will be prepared for the Director of Public Prosecutions."

"An incident room has been established at Kilkenny Garda Station and a Family Liaison Officer has been appointed to the case."

Those with information are asked to contact Kilkenny Garda station on 056 7775000, the Garda Confidential Telephone Line on 1800 666 111 or any Garda station.